mineral

Pyrite

Iron Disulfide (FeS2)

AI-generated identification · may be incorrect

Hardness: 6-6.5 Mohs; Color: Pale brass-yellow; Luster: Metallic; Crystal Structure: Isometric; Cleavage: Poor/Indistinct; Specific Gravity: 4.8-5.0

Hardness: 6-6
Color: Pale brass-yellow
Luster: Metallic

Identified July 21, 2026More mineral →

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Physical properties

Hardness: 6-6.5 Mohs; Color: Pale brass-yellow; Luster: Metallic; Crystal Structure: Isometric; Cleavage: Poor/Indistinct; Specific Gravity: 4.8-5.0

Formation & geological history

Forms in a variety of geological settings including hydrothermal veins, as an accessory mineral in igneous rocks, in contact metamorphic rocks, and as a replacement mineral in sedimentary rocks (fossils).

Uses & applications

Commonly used as a source of sulfur for sulfuric acid production; historically used in firearms (wheel-lock); currently used in jewelry (as marcasite) and as a collector specimen.

Geological facts

Often called 'Fool's Gold' due to its resemblance to precious metal, though it is much harder and more brittle. It is one of the most common sulfide minerals.

Field identification & locations

Identifiable by its brassy color, cubic crystal habit, and blackish-green streak. It occurs globally, with notable deposits in Spain, Peru, and the USA.